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  3. Which of the following best explains what makes diamond a good engineering material? Which comparison is true according to the

Which of the following best explains what makes diamond a good engineering material? Which comparison is true according to the

admin2009-06-24  52
问题 Which of the following best explains what makes diamond a good engineering material?
Which comparison is true according to the passage?
选项 A、Diamond jewels are more expensive than jewels of other materials.
B、Lab-produced diamonds outnumber natural diamonds.
C、Diamonds conduct heat as well as silicon.
D、De Beers started making synthetic diamonds much earlier than General Electric.
答案B
解析
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